etl会占用oracle游标吗,ETL通用解决方案—oracle+存储过程 实现

游标吗,ETL通用解决方案—oracle+存储过程 实现"/>

etl会占用oracle游标吗,ETL通用解决方案—oracle+存储过程 实现

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专业的SQL Server、MySQL数据库同步软件

–INTEGRITY PACKAGE DECLARATION

CREATE OR REPLACE PACKAGE INTEGRITYPACKAGE AS

PROCEDURE INITNESTLEVEL;

FUNCTION GETNESTLEVEL RETURN NUMBER;

PROCEDURE NEXTNESTLEVEL;

PROCEDURE PREVIOUSNESTLEVEL;

END INTEGRITYPACKAGE;

/

–INTEGRITY PACKAGE DEFINITION

CREATE OR REPLACE PACKAGE BODY INTEGRITYPACKAGE AS

NESTLEVEL NUMBER;

–PROCEDURE TO INITIALIZE THE TRIGGER NEST LEVEL

PROCEDURE INITNESTLEVEL IS

BEGIN

NESTLEVEL :=0;

END;

–FUNCTION TO RETURN THE TRIGGER NEST LEVEL

FUNCTION GETNESTLEVEL RETURN NUMBER IS

BEGIN

IF NESTLEVEL IS NULL THEN

NESTLEVEL :=0;

END IF;

RETURN(NESTLEVEL);

END;

–PROCEDURE TO INCREASE THE TRIGGER NEST LEVEL

PROCEDURE NEXTNESTLEVEL IS

BEGIN

IF NESTLEVEL IS NULL THEN

NESTLEVEL :=0;

END IF;

NESTLEVEL :=NESTLEVEL + 1;

END;

–PROCEDURE TO DECREASE THE TRIGGER NEST LEVEL

PROCEDURE PREVIOUSNESTLEVEL IS

BEGIN

NESTLEVEL :=NESTLEVEL-1;

END;

END INTEGRITYPACKAGE;

/

CREATE OR REPLACE PROCEDURE PRO_CREATE_VIEW_BY_ETL_VIEWS

AS

————–PRO_CREATE_VIEW_BY_ETL_VIEWS————————

–CREATED ON 2009-2-1 BY CYYAN@ISOFTSTONE

–功能 : 根据ETL_VIEWS中到数据生成视图

——————————————————————————

VIEW_CREATE_CODE VARCHAR2(10000);–生成视图到代码

VIEW_NAME VARCHAR2(100);–视图名称

VIEW_SELECT VARCHAR2(4000);–视图的SELECT部分

VIEW_FROM VARCHAR2(300); –视图的FROM部分

VIEW_WHERE VARCHAR2(3000); –视图的WHERE部分

VIEW_ORDER_BY VARCHAR2(600); –视图的ORDER BY部分

VIEW_GROUP_BY VARCHAR2(600); –视图的GROUP BY部分

VIEW_HAVING VARCHAR2(600); –视图的HAVING部分

VIEW_DB_LINK_NAME VARCHAR2(100); –视图的DB LINK部分

ROW_COUNT NUMBER;–行数

CURSOR ETL_VIEWS_CURSOR IS–提取创建视图需要到信息

SELECT VIEW_NAME, VIEW_SELECT, VIEW_FROM, VIEW_WHERE, VIEW_ORDER_BY, VIEW_GROUP_BY, VIEW_HAVING, VIEW_DB_LINK_NAME FROM ETL_VIEWS T WHERE T.CURRENT_VERSION=(SELECT MAX(T2.CURRENT_VERSION) FROM ETL_VIEWS T2 WHERE T.VIEW_NAME=T2.VIEW_NAME);

BEGIN

–统计行数

SELECT COUNT(*) INTO ROW_COUNT FROM ETL_VIEWS T WHERE T.CURRENT_VERSION=(SELECT MAX(T2.CURRENT_VERSION) FROM ETL_VIEWS T2 WHERE T.VIEW_NAME=T2.VIEW_NAME);

OPEN ETL_VIEWS_CURSOR;–打开游标

FOR I IN 1..ROW_COUNT LOOP–遍历

FETCH ETL_VIEWS_CURSOR

INTO VIEW_NAME, VIEW_SELECT, VIEW_FROM, VIEW_WHERE, VIEW_ORDER_BY, VIEW_GROUP_BY, VIEW_HAVING, VIEW_DB_LINK_NAME;

—拼接创建视图到语句

VIEW_CREATE_CODE :=’create or replace view ‘ || VIEW_NAME || ‘ as select ‘ || VIEW_SELECT || ‘ from ‘ || VIEW_FROM;

IF VIEW_DB_LINK_NAME IS NOT NULL THEN

VIEW_CREATE_CODE :=VIEW_CREATE_CODE || ‘@’ || VIEW_DB_LINK_NAME;

END IF;

IF VIEW_WHERE IS NOT NULL THEN

VIEW_CREATE_CODE :=VIEW_CREATE_CODE || ‘ where ‘ || VIEW_WHERE;

END IF;

IF VIEW_ORDER_BY IS NOT NULL THEN

VIEW_CREATE_CODE :=VIEW_CREATE_CODE || ‘ order by ‘ || VIEW_ORDER_BY;

END IF;

IF VIEW_GROUP_BY IS NOT NULL THEN

VIEW_CREATE_CODE :=VIEW_CREATE_CODE || ‘ group by ‘ || VIEW_GROUP_BY;

END IF;

IF VIEW_HAVING IS NOT NULL THEN

VIEW_CREATE_CODE :=VIEW_CREATE_CODE || ‘ having ‘ || VIEW_HAVING;

END IF;

–输出创建语句

–DBMS_OUTPUT.PUT_LINE(VIEW_CREATE_CODE);

–DBMS_OUTPUT.PUT_LINE(”);

–执行创建视图

EXECUTE IMMEDIATE VIEW_CREATE_CODE;

END LOOP;

CLOSE ETL_VIEWS_CURSOR;–关闭游标

END;

/

CREATE OR REPLACE PROCEDURE PRO_INSERT_INTO_ETL_VIEWS

AS

–ADD BY CYYAN@ISOFTSTONE

–2009年2月1日21:33:37

—此存储过程用于 将ETL_TABLE中标识需要创建VIEW 到TABLE, 进行自动提起转换到ETL_VIEWS中.

–处理过程用到啦系统表COL从此表中获取列名

TABLE_NAME VARCHAR2(100);–表名

COL_NAME VARCHAR2(100);–列名

TABLE_COUNT NUMBER;–表到行数

–COL_COUNT NUMBER;–列数

ETL_VIEWS_INSERT_CODE VARCHAR2(600);–插入语句到 INSERT部分

ETL_VIEWS_VALUES_CODE VARCHAR2(16000);–插入语句到VALUES部分

–ETL_VIEWS的到列

VIEW_NAME_PREFIX VARCHAR2(30);–实体名到前缀

TABLE_TYPE VARCHAR2(30);–表类型 如 DB, ODS, DW

TABLE_ROOT_IN VARCHAR2(30);–表来源, 来自那个系统, 如资金系统”NHZJ”, 财务系统”NHCW”

VIEW_SELECT VARCHAR2(10000);–VIEW 语句到SELECT部分, 这个需要遍历一个表到所有列

DB_LINK_NAME VARCHAR2(100);

CURRENT_VERSION VARCHAR2(600);–版本部分, 这里没更新, 只要全部删除, 或不断插入, 此字段定义了版本, 没有变更都形成新到版本, 取值是取最大值

CURSOR_NUMBER NUMBER;

COL_SELECT_SQL VARCHAR2(100);

RETURN_VALUE NUMBER;

–从ETL_TABLES中查询需要生成视图到表

CURSOR DB_TABLES_CURSOR IS

SELECT UPPER(TABLE_NAME), T.TABLE_TYPE, T.TABLE_ROOT_IN, T.TABLE_CREATE_VIEW_NAME_PREFIX, DB_LINK_NAME FROM ETL_TABLES T WHERE (UPPER(T.TABLE_TYPE)=’DB’ OR UPPER(T.TABLE_TYPE)=’DW’ ) AND T.TABLE_NEED_CREATE_VIEW=1;

–CURSOR_NUMBER NUMBER;–游标 OLD WAY 执行需要, NEW WAY 不需要

–RETURN_VALUE NUMBER;–执行后返回值 OLD WAY 执行需要, NEW WAY 不需要

BEGIN

–TEST STATEMENTS HERE

SELECT COUNT(*) INTO TABLE_COUNT FROM ETL_TABLES T WHERE (UPPER(T.TABLE_TYPE)=’DB’ OR UPPER(T.TABLE_TYPE)=’DW’ ) AND T.TABLE_NEED_CREATE_VIEW=1;

–构造INSERT部分

ETL_VIEWS_INSERT_CODE :=’insert into etl_views(view_name, view_type, view_root_in, view_select, view_from, current_version, VIEW_DB_LINK_NAME) ‘;

OPEN DB_TABLES_CURSOR;

FOR I IN 1..TABLE_COUNT LOOP–表遍历

FETCH DB_TABLES_CURSOR

INTO TABLE_NAME, TABLE_TYPE, TABLE_ROOT_IN, VIEW_NAME_PREFIX, DB_LINK_NAME;

–构造VALUES部分

ETL_VIEWS_VALUES_CODE :=’values(”’ || VIEW_NAME_PREFIX || TABLE_NAME || ”’, ”’ || TABLE_TYPE || ”’, ”’ || TABLE_ROOT_IN || ””;

DBMS_OUTPUT.PUT(TABLE_NAME);

–ANOTHER WAY USER DBMS_SQL PACKAGE

COL_SELECT_SQL :=’select tame from sys.col@’ || DB_LINK_NAME || ‘ T where T.tname=”’ || TABLE_NAME || ””;

–SQL_CODE :=’select tame from sys.col T where T.tname=”’ || TABLE_NAME || ””;

CURSOR_NUMBER :=DBMS_SQL.OPEN_CURSOR();

DBMS_SQL.PARSE(CURSOR_NUMBER, COL_SELECT_SQL, DBMS_SQL.NATIVE);

DBMS_SQL.DEFINE_COLUMN(CURSOR_NUMBER,1,COL_NAME, 100);

RETURN_VALUE :=DBMS_SQL.EXECUTE(CURSOR_NUMBER);

DBMS_OUTPUT.PUT_LINE(‘ RETURN_VALUE=’ || RETURN_VALUE);

RETURN_VALUE :=DBMS_SQL.FETCH_ROWS(CURSOR_NUMBER);–获取第一列

DBMS_SQL.COLUMN_VALUE(CURSOR_NUMBER,1,COL_NAME);

VIEW_SELECT :=COL_NAME;

WHILE DBMS_SQL.FETCH_ROWS(CURSOR_NUMBER)<>0 LOOP—遍历其它到列

DBMS_SQL.COLUMN_VALUE(CURSOR_NUMBER,1,COL_NAME);

DBMS_OUTPUT.PUT_LINE(COL_NAME);

VIEW_SELECT :=VIEW_SELECT || ‘, ‘ || COL_NAME;

END LOOP;

— DBMS_OUTPUT.PUT_LINE(‘VIEW_SELECT : ‘ || VIEW_SELECT);

DBMS_SQL.CLOSE_CURSOR(CURSOR_NUMBER);

–生成最新到版本号: 视图名称是唯一的

SELECT NVL(MAX(CURRENT_VERSION),0) + 1 INTO CURRENT_VERSION FROM ETL_VIEWS V WHERE V.VIEW_NAME=VIEW_NAME_PREFIX || TABLE_NAME;

ETL_VIEWS_VALUES_CODE :=ETL_VIEWS_VALUES_CODE || CHR(10) || ‘, ”’ || VIEW_SELECT || ”” || CHR(10) || ‘, ”’ || TABLE_NAME || ”’, ”’ || CURRENT_VERSION || ”’, ”’ || DB_LINK_NAME || ”’)’;

–输出插入到语句

–DBMS_OUTPUT.PUT_LINE(ETL_VIEWS_INSERT_CODE);

–DBMS_OUTPUT.PUT_LINE(ETL_VIEWS_VALUES_CODE);

–DBMS_OUTPUT.PUT_LINE(”);

–DBMS_STANDARD.

–执行插入语句

–NEW WAY

EXECUTE IMMEDIATE ETL_VIEWS_INSERT_CODE || ETL_VIEWS_VALUES_CODE;

END LOOP;

COMMIT;–提交

CLOSE DB_TABLES_CURSOR;–关闭游标

–EXCEPTION

–ROLLBACK;

END;

/

CREATE OR REPLACE TRIGGER TRG_ID_ON_ETLS

BEFORE INSERT ON ETLS

FOR EACH ROW

DECLARE

–NOTHING

BEGIN

SELECT SEQ_ETL_INCREASE_ID.NEXTVAL INTO :NEW.ID FROM DUAL;

END TRIGGER_ID_INCREASE;

/

CREATE OR REPLACE TRIGGER TRG_ID_ON_ETL_TABLES

BEFORE INSERT ON ETL_TABLES

FOR EACH ROW

DECLARE

–NOTHING

BEGIN

SELECT SEQ_ETL_INCREASE_ID.NEXTVAL INTO :NEW.ID FROM DUAL;

END TRIGGER_ID_INCREASE;

/

CREATE OR REPLACE TRIGGER TRG_ID_ON_ETL_VIEWS

BEFORE INSERT ON ETL_VIEWS

FOR EACH ROW

DECLARE

–NOTHING

BEGIN

SELECT SEQ_ETL_INCREASE_ID.NEXTVAL INTO :NEW.ID FROM DUAL;

END TRIGGER_ID_INCREASE;

/